.., I am thinking of 'firethorn' ,..
I don't have a firethorn hedge, but do have several individual plants. I think that this plant would make a wonderful hedge. It's virtually evergreen, so gives better privacy than hawthorn during the Winter months. It's thorns are far more vicious than hawthorn so it gives better security. The fruits are plentiful and very colourful. Visually, it looks more spectacular than hawthorn. Firethorn is available in yellow, red, or orange varieties.
I've never tried to trim this plant, as a hedge, so I don't know how it responds to trimming. Or how trimming effects flowering and fruiting. You would need to be well protected, including eye protection.